ESR of Mo3+ ions and NMR of 27Al nuclei is investigated in mixed single crystals of yttrium-lutetium-aluminum garnets (Y1-zL~z)3A15012, where 0 5 xs 1. Several new centres of Mo3+ and 27Al compared with Y,Al,O,, and Lu3A150,, single crystals are revealed associated with symmetry and crystalline field parameter changes a t isomorphous substitution of Y3+ ions in therare-earth sublattice of the garnet by those of Lu3+. Symmetry, nearest coordination, and parameters of spin-Hamiltonians are estimated concerning all of M03+ and 27Al centres in (Y1-zLu,),Al,O1, at6~a p y x c e~ pf€n HOBblX, no CpaBHeHtiIo C Y3AI,01, II Lu3A1501,, UeHTPOB M03+ ti 27A1, 06yCJIOBJEHHbIX ti3MeHeHHFIMH CtiMMeTpMti ti IlapaMeTpOB HPtiCTaJIJIHYeCKOrO nOJIII npH ti3OMOp@HO~ 3aMeHe Y3+ Ha LU3+ B penK03eMenbHOi nOAPC!lueTK€! rpaHaTOB. YCTaHOBJleHbI CEIMMeTPHH, 6ntimafiluee OKpyWeHEie EI OIIpeHeJleHbl IIapaMeTpbI CnHH-FaMHJlbTOHIIaHOB BCeX UeHTPOB Mo3+ ti 27Al B KpacTannax (Y1-zLuJ3A1501, npti x < 0,15.
W e i s an antiferromagnetic semiconductor with cubic NaCl structure. The present paper discusses investigations on magnetic resonance in MnSe polycrystalline powders in the range from 140 to 300 K. 0 Crystals of MnSe were obtained by vapour transport reaction (1). Stoichiometric and selenium 5 N were destillated under a pressure of 10 tion of iodine was 3 mg/cm and the temperature of source and growth regions wert 915 and 870 C, respectively. The habit of crystals were octahedra of edge length 1 mm. amounts of manganese and selenium were used. Spectrally pure manganese -5 Torr. The concen,,..3 0 The measurements were performed with an X-band (9.3 GHz) microwave spectrometer. The temperature was stabilized automatically and measured with acopper-constantanthermocouple with accuracy of 1 deg. A broad EPR line with g = 1.930 was observed in the paramagnetic region. The line was broadened asthe temperature was reduced in the direction of the NBel temperature (Fig. 1).The shape of the EPR line was tested by the 1: method, It depends on temperature until about 150 K it has Lorentzian shape and below this temperature it becomes asymmetric. The linewidth measurements were fitted by a relation predicted theoretically by Huber (2) 2 0 T -TN -r A € I = A ( 7 ) + B , 0where A = 200 G, paper a r e the peak-to-peak magnetic field separation in the absorption derivative.The magnetic strength and the linewidth were measured by means of an NMR m a gnetometer.r= 0 . 6 0 , B = 0 , T = 132 K. The linewidths reported in this N Experimental results cannot by described by any of the existing theories (2 to 1. These results a r e in good accordance with Battles' (5) 4) which predict
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